Radio glitch again delays Mars dig

Lander is fine, but orbiter fails to relay instructions to penetrate soil

ALICIA CHANG, Associated Press |
June 5, 2008

A footprint-like impression on the Mars turf is actually a mark left by the Phoenix lander's robotic arm.

LOS ANGELES — The Phoenix lander's first dig into the Martian soil for scientific study was delayed Wednesday because of a communications glitch on a spacecraft that relays commands from Earth to the red planet.

The orbiting Odyssey satellite went into safe mode and failed to send instructions to Phoenix to claw into the permafrost to search for evidence of the building blocks of life, said Chad Edwards, chief telecommunications engineer at NASA's Jet Propulsion Laboratory in Pasadena.

It's the second time a relay problem has delayed the lander's schedule. The first glitch occurred two days after it landed, when another satellite, the Mars Reconnaissance Orbiter, turned off its radio.

Engineers worked to fix the problem with Odyssey, which will remain offline until Saturday, Edwards said. A preliminary investigation revealed the safe mode was probably triggered by high-energy particles from space interrupting the satellite's computer memory.

"The lander is fine," Edwards said.

Phoenix set down in Mars' northern latitudes to study whether the polar environment is capable of supporting primitive life. It communicates with Earth through Odyssey and the Reconnaissance Orbiter, which make daily passes over the lander to send commands and beam back images.

With Odyssey temporarily out of service, engineers told the Reconnaissance Orbiter to be the middleman between the lander and Earth.

Phoenix had planned to dig the first of three shallow pits north of where it landed and dump the dirt into a tiny oven, where it will be baked and studied this week. The earliest the lander can start the excavation will be today, when new commands will be sent up.

The green light to scrape the Martian surface came after an extensive check of Phoenix's 8-foot robotic arm.

"It's absolutely an incredibly science-rich location," said chief scientist Peter Smith of the University of Arizona, Tucson, who heads the three-month, $420 million mission.